Dual-inverter for grid-connected photovoltaic system: Modeling and sliding mode control

• Published in: Solar energy Vol. 86; no. 7; pp. 2106 - 2115
• Main Authors: Fernão Pires, V., Martins, J.F., Hao, Chen
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.07.2012; Elsevier; Pergamon Press Inc
• Subjects: Algorithms; Applied sciences; Dual inverter; Electric currents; Electrical engineering. Electrical power engineering; Electrical machines; Energy; Equipments, installations and applications; Exact sciences and technology; Natural energy; Photovoltaic cells; Photovoltaic conversion; Photovoltaic system; Power converter; Power electronics, power supplies; Regulation and control; Robust control; Sliding mode controller; Solar energy; Transformers; Transformers and inductors; Vector modulator; Power converter; Dual inverter; Sliding mode controller; Photovoltaic system; Vector modulator; Performance evaluation; Inverter; Modulator; Sliding mode; Control system; Feeding device; Three phase transformer; Grid-connected system; Power electronics; Topology; Algorithm; Voltage control; Modeling; Robust control; Reactive power; Effectiveness factor; Multilevel system
• ISSN: 0038-092X; 1471-1257
• DOI: 10.1016/j.solener.2012.04.012

► A multilevel inverter based on a dual two-level inverter topology for grid connected photovoltaic system. ► There are two isolated PV generators that feeding each bridge inverter. ► A model of the multilevel system is presented. ► The active and reactive powers flowing into the grid are controlled by a sliding mode algorithm. A fast and robust control strategy for a multilevel inverter in grid-connected photovoltaic system is presented. The multilevel inverter is based on a dual two-level inverter topology. There are two isolated PV generators that feeding each bridge inverter. The output of each inverter is connected to a three-phase transformer. The active and reactive powers flowing into the grid are controlled by a sliding mode algorithm. An alfa–beta space vector modulator is also used. The inverters DC voltages are also controller by a sliding mode controller. In this way, a fast and robust system controller is obtained. Several test results are presented in order to verify the effectiveness of the proposed system controller.